A Boko Haram flag flutters from an abandoned command post in Gamboru deserted after Chadian troops drove the militants out in February 2015Getty Images

Leaders of Boko Haram terror group are divided over recent attacks targeting innocent civilians at internally displaced people (IDP) camps in northeastern Nigeria, according to a Nigerian journalist. Ahmad Salkida, who is in self-exile in the United Arab Emirates after allegedly receiving death threats, claimed there was growing discontent within Boko Haram ranks, whose militants have killed thousands of people in northern Nigeria and neighbouring countries since 2009.

The journalist – who had strong ties with BokoHaram's late leader, MohammedYusuf – claimed some BokoHaram members are voicing their dissent against their leader AbubakarShekau, rumoured to have been killed given his prolonged absence from the group's videos.

Salkida – who in 2009 was exiled from Borno state, northeastern Nigeria, after being accused of "counter-intelligence" crimes – quoted an unnamed source explaining that dozens of displaced people were killed by BokoHaramearlier in February as they were seen as supportive of the Nigerian government. The attacks also aimed to embarrass the Nigerian government and show that "nowhere is safe for these people".

Who are Nigeria's Boko Haram terrorists?

Boko Haram, which has renamed itself Iswap, fights against Western influence in Nigeria and aims to impose its version of Sharia law throughout occupied territories.

Boko Haram carries out attacks in Nigeria and neighbouring countries in a bid to take control of more territory. Three Nigerian states − Adamawa,Borno and Yobe − have been under a state of emergency since May 2013.

Boko Haram has killed at least 20,000 people since 2009 and was deemed the world's deadliest terror group, surpassing its ally Islamic State (Isis) in November 2015.

"But a leading member within the leadership rank dismisses this line of argument by his colleagues," Salkida wrote on his blog. "He warns that 'we cannot be subjecting more hardship and grief to the people more than the army of the Kufr [unbelievers] subjects them to.'"

However, Salkida quoted another unnamed militant as saying the group was working to reconcile the disagreement. The source added BokoHaram "remains strong in our resolve to continue this violent campaign against constituted authorities in West Africa".

Boko Haram 'split' between IS and al-Qaeda groups

According to Salkida and some analysts, disagreements within the group might explain why growing numbers of Boko Haram fighters are travelling to Libya and Syria to join the Islamic State (Isis/Daesh) terror group, Boko Haram's ally since March 2015.

"Investigations reveal that there has been a raging disquiet in their ranks on the way things are being run, leading to break-away and desertion, leaving those that can't leave to grumble quietly," said Salkida. "Multiple sources reveal that many members have moved to Libya, Syria and other battlegrounds to fight there, promising the comrades they left behind to come back 'when things have changed'. Others are reported to have rejoined the growing Al-Qaeda cells in the region."

David Otto, chief executive of TGS Intelligence Consultants, confirmed to IBTimes UK that disagreement within the group might explain "the recent revelation that some BokoHaram members decided to travel to Libya".

Otto added: "This also relates to the split that BokoHaram faced after it pledged allegiance to IS: Not all members were in favour of the shift and the group is now split between al-Qaeda and IS. The split should be seen by authorities as an opportunity to launch an honest mediation or dialogue platform that can attract those members who are willing to leave Boko Haram but have no where to go or any trusted official channel to take.

"Terrorist organisations like Boko Haram are most vulnerable to collapse and self destruction when faced with internal splits on strategy, but the counter strategy has to be right and timely," Otto concluded.